Thread: 01 4t65e tranny shudder problem

Hi guys, I'm new here. I'm a regular member over at News - NAIOA and I posted my problem over there but it's not getting much help. This forum looks a lot more active so I thought, let me post it over here! Here is a copy & paste from my thread on NAIOA. Thanks in advance guys.
The car is a 2001 Chevrolet Impala LS 3.8 with 116,289 miles on it as of 6/20/2011.

Here starts the long ass story; sorry!

I've been doing a lot of highway driving lately and I've been noticing after driving 70-85mph for awhile, and then slowing down to city speeds 35-55mph, the shifts are pretty slow/sloppy, and the tranny is whining VERY loud, throughout 1st, 2nd and 3rd gears. I'm guessing that's the PCS whining? If I turn the car off for awhile and let it cool off and drive off again it's still loud, but the shifts are back to normal and it's all good. Okay, now where it gets bad. Friday afternoon, backing out of the garage into the road, and then I put it in Drive. Upon giving it gas it shuddered like hell and up until 3k rpm it barely moved, and then SLAMMED into gear and spun the tires...so much that traction control engaged. It did this two more times as I was leaving my neighborhood, and then drove off fine, and has been driving fine..even drove 160miles on the highway and it didn't hiccup once..just the tranny was whining loud as hell like usual. It has been giving me problems with slamming into gear after not being driven for awhile (usually after sitting overnight) for a long time now.

My car just rolled over 116k miles, its at about 116,251miles right now.

I was wondering what route would be best for me?

Should I attempt at replacing the PCS, and while having it all apart, doing the shift kit while I am at it? http://www.ls1tech.com/forums/.....movie.html That link makes it seem pretty simple and straight forward to install the kit. If installing the kit along with replacing the PCS as well as whatever else is easy to get to when I'm down there will give me little longer on this tranny PLEASE let me know.

Other than what happened on Friday, it has been shifting PERFECTLY for the last 116k miles of the transmission's life. The torque converter still locks up great, never surges, 4th gear is still intact...

Thanks for the help in advance, and sorry for the long ass story...this car's my baby and I would hate to have to get rid of it.


Here is a link to the thread on NAIOA.
http://www.naioa.com/v2/modules.php?...wtopic&t=44674

Thanks again!

Originally Posted by BillBoost37

Whining is typically a sign that the pump is starving for fluid. Have you ever had the transmission serviced?

The harsh engagement/sloppy shifts could be a sticking valve etc. Typically the PCS will toss a code and give you max adapt shifting based on pressure issues. The rest of the behaviors you have described don't really fit with the pcs.

BTW, to get to the pcs you need to lower your trans mostly out of the car to get the side cover off.

Unfortunately no the transmission has never been serviced in it's life. I check the tranny fluid on a monthly basis and it's not too dirty, it still has a red/pinkish hue to it. If the PCS is starving for fluid could the filter be dirty? After this whole big ordeal last week something made me remember that the MAF sensor has something to do with line pressure so I went out and got some CRC MAF sensor cleaner yesterday and I cleaned the MAF for the first time, and some black stuff came off of it. I'm not sure if that helped at all.

What would explain the shuddering that happened? I don't have a code reader that will read transmission codes, would a tranny code trigger a CEL?

I know that getting to the PCS requires the whole left side of the subframe/cradle to be lowered a bunch, I was prepared for that.

If it's starving for fluid should I make an attempt at dropping the pan, removing the accumulator and installing a shift kit to reduce slipping on the 1-2 and 2-3 shifts, and then replace the filter and then close up and refill her up?

What I'm trying to do is, being that the tranny has never been touched in 116k miles while I'm going to have it apart should I just replace the PCS along with any other solenoid/sensor that's easily accessible just so I make sure they don't go bad once I close the tranny back up and have to tear it apart again?

Thanks

Originally Posted by BillBoost37

Wow.. you have some info, sounds like it's kinda mashed together in a random order though. I've never read or heard of Maf controlling line pressure, it is used to determine shifts etc along with TPS.

Since the trans is still a young transmission. Drop the pan, change the filter and refill with one quart of Lucas trans stop slip and the rest Dex 3 regular fluid (no syn).

A whining from the pump starving for fluid can easily be a clogged filter.

Thanks for the fast reply. I know I'm sorry I mashed a bunch of stuff together. I'm only 16, almost 17 and I've read all the horror stories about these 4t65e trannies and I almost teared up Friday afternoon when it started shuddering....I love my car, it was given to me by my parents when I turned 16 and it was my mom's car babied since we purchased it brand new in 2000.

You don't recommend putting in a shift kit? I've read that it's super easy to do and is usually a good preventative measure.

If you don't recommend putting in the shift kit, I will most definitely drop the pan, replace the filter and refill with what you told me to. Any reason why you didn't say to put Dex 6 in?

Would like to provide a quick update. Ordered the kit last night and it shipped out today. Expected delivery date is Monday the 27th, and should be installed a few days after that. I'll get pics when we take off the pan!

I tackled the shift kit myself tonight. I waited until my dad got home to make sure if I got stuck anywhere that he would help me. BTW, it hasn't done the shuddering since 3 days after I posted about it....weird but whatever. The fluid was in there for 117k miles, and came out like it was water, that's how old it was. Luckily, the pan had NO surprises for me! The magnet had stuff on it but that was expected. There were NO chunks/slivers/nothing on the pan, just the normal stuff, for a 117k mile car. I followed all instructions that came with the shift kit, and a little help from the thread on LS1Tech forum. Put it all back together, filled up with 7 quarts of Valvoline MaxLife Dex/Merc III and a bottle of lucas trans fix and took it for a drive. It shifts like a dream, and the whine when in "1" is now GONE, reduced to BARELY being able to hear it.

I started it at 6:30, ate dinner thru it, and drove it at 9. Not bad for a 16 yr old doing it by himself.

Here is a video that I took when I went out. The SVS light is on because I do not have my high beam bulbs in so it can't turn on the DRLs, I had it scanned at the local Chevy dealership. Also had them address the problem I was having with the connections under the seat that triggers the SRS light to come on the dash....all fixed!

VIDEO0002.mp4 video by bmcgee101 - Photobucket

I am in love!

Originally Posted by copgtp

Good job man!

Thanks bro! I put 170 miles on it the day after I did it, and it has never driven better! Seems like I should get a lot more out of the tranny now..